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Код

private StreamWriter file;
        private FileStream fs;
        private Graphics grfx;
        private Bitmap bmp;
        private string temp;
        //Определяем таймер
        private System.Timers.Timer timer1;
        private const string MY_PATH = @"D:\";
        private const string EXTENSION = ".bmp";

        protected override void OnStart(string[] args)
        {
            file = new StreamWriter(new FileStream("D:\\temp.log",
    System.IO.FileMode.Append));
            this.file.WriteLine("MyFirstService стартовал");
            this.file.Flush();
            //Создаем таймер и выставляем его параметры
            this.timer1 = new System.Timers.Timer();
            this.timer1.Enabled = true;
            //Интервал 10000мс - 10с.
            this.timer1.Interval = 10000;
            this.timer1.Elapsed +=
             new System.Timers.ElapsedEventHandler(this.timer1_Elapsed);
            this.timer1.AutoReset = true;
            this.timer1.Start();
        }

        protected override void OnStop()
        {
            this.timer1.Stop();
            this.file.WriteLine("MyFirstService остановлен");
            this.file.Flush();
            this.file.Close();
        }

        private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            //Записываем время в файл или делаем все, что хотим

            this.temp = MyFirstService.MY_PATH + DateTime.Now.ToString("d.M.yyyy-HH.mm.ss") + MyFirstService.EXTENSION;
            this.fs = File.Create(temp);
            this.fs.Close();
            this.bmp = new Bitmap(1280, 800);
            this.grfx = Graphics.FromImage(bmp);
            this.grfx.CopyFromScreen(0, 0, 0, 0, new Size(1280, 800));
            this.bmp.Save(temp);
        }